Drawing board table support clamp



OCf- 8, 1963 R. J. scoTT 3,106,376

DRAWING BOARD TABLE SUPPORT CLAMP Filed Sept. 28, 1961 iQ-RK v Ez-Ei. 5

INV EN TOR. /PQLA/vo J' 56077.'

United StatesA Patent O `3,106,376 DRAWING BOARD TABLE SUPPORT CLAMPRoland I. Scott, 2918 N. 76th St., Scottsdale, Anz.

Filed Sept. 28, 1961, Ser. No. 141,372

3 Claims. `(Cl. 248-226) `This invention pertains to a support clamp andisparticularly directed to a `drawing board table support clamp.

One of the objects of this invention 'is to provide a clamp forsupporting a drawing board in conveniently usable position on the edge`of a table or other similar supporting structure. j Y t Another objectof this invention is to provide a drawing board support clamp ofuniversal construction adapted to readily grip the edge of the top andthe apr-on of a table to securely hold a drawing board in workingposition. p

A further object of this invention is to provide a clamp for engagingthe top and the bottom of a table together with a clamp screw adapted toengage the apron of a table to securely lock the clampjdevice to thetable.

lFurther features and advantages -of this invention will appear from adetailed description of the drawings in which: p

FIG. 1 is a fragmentary plan viewof the drawing board table supportclamp applied in working position to a table top.

FIG. y2 is a side elevation of the apparatus shown in FIG. l, `shownpartly in section on the line 2-2 of FlG. l.

FIG. 3 is a fragmentary section .on the line 3-3 of FIG. 2. t

FIG. `4 is a view similar to thatfof FIG. 2, showing a modification ofthe clamp screw mechanism.

`As an example of` one embodiment of this invention, there is shown atable having a top and the depending apron 11. The drawing boar-dsupport clamp comprises the C-shaped member 12 having the bottom 13 andthe upstanding rear and front portions 14 and l15, respectively., On thetop end of the front portion is formed a turned over inwardly extendingportion 16 having a downwardly facing abutment surface 17 which engagesthe top surface 18 of the top I10 of the table. A vertically disposedinwardly facing abutment surface 19 formed on the front portion of theclamp 12 engages the front edge 20 of the top 10 of the table.

On top of the rear portion 14 is formed a pad 21 having a horizontalupwardly facing abutment surface 22 which is adapted to engage thebottom surface 23 of the top y10 of the table. To adjustably secure thedrawing board 24 or other object to the clamp 12 there is formed anintegral lug 25 on the upper part of the front portion 15 having a bolthole 26 and radial serrations 27 extending outwardly therefrom which areengaged by mating serraftions 28 formed on the lug 29` of the crows-footdrawing board support bracket 30 which is fastened to the underside 31of the drawing board 24 by suitable screws 32. A suitable clamp bolt 33passes through the lugs 2S and 29 and has a clamping wing nut 34 to lockthe `drawing board in idesired'tilted positions.

Clamping pressure to secure the clamp 12 to the table is appliedhorizontally parallel to the abutment surfaces 17 and 22 and opposed tothe abutment surface 19 against the inside surface 35 of the apron`11lof the table at a point below the abutment surfaces '17 and 21.clamping pressure may be effected by means of a clamp screw 36 having athreaded portion -37 which passes through a clearance hole 38 formed inthe front portion 15 of the clamp 12 and having fixed to its outer endthe U-shaped member 39 itting around the apron 11. The

This p 31,106,376 Patented Oct. 8, 1963 ICC i U-shaped member 39 has aninner abutment surface 40 adapted to engage the inside surface 35 lofthe apron 11 when the' wing nut -41 carried on the threaded portion 37of the clamp screw 36 is tightened against theoutside face 42 of thefront portion 15 to force abutment surface 19 against the front edge`20` of the table top and at the same time forcing abutment l22 againstthe underside 23 of the top 10 to securely lock the clamp 12 to thetable. n Y

In FIG. 4 is shown a modification in which a clamp screw 43 is threadedat 44 and has its outer en'd 4S in abutting contact with the insidesurface 35 of the apron 11 so as to secure the clamp 12 tothe table asin the case of the showing in FIGS. '1, 2 and 3.

While the apparatus herein disclosed and described constitutes apreferred form of the invention, it is also to be understood that theapparatus is capable of mechanical alteration without departing from thespir-it of the iuventiongand that such mechanical arrangement andcommerical adaptation as fall within the scope of the appendent claimsare intended to be included herein. Having thus fully set forth anddescribed this invention what is` claimed and desired to be obtained byUnited States Letters Patent is:

yl. A clamp, adapted to grip and hold an object to a table having a topand an apron depending downwardly yfrom under said top, comprising incombination:

a. a C-shaped member-having a horizontal bottom portion, an opstandingrear portion and an upstanding front portion,

b. a turned over inwardly extending portion formed on the top of saidfront porti-on and havin-g a downwardly facing abutment surface adaptedto engage face formed on the front portion of said clamp adapted toengage the front edge of the table top adjacent said turned overinwardly extending portion of said clamp,

d. an abutment pad formed on top of said rear portion and having anupwardly facing abutment surface adapted to engage the bottom surface ofthe table top,

e. means on the upper part of said front portion for supporting adrawing board and the like on said clamp,

f. and means on said clamp adapted to engage the inside surface of thetable apron with horizontal pressure parallel to and below said abutmentsurface on said turned over inwardly extending portion and said abutmentpad of said clamp and above the lower edge of the table apron in anopposed direction to said vertically disposed inwardly facing abutmentsurface on said front portion so as to rigidly secure said clamp to thetable.

2. A clamp, adapted to gripV and hold an object to a table having a topand an apron depending downwardly from under said top, comprising incombination:

a. a C-shaped member having a horizontal bottom portion, an upstandingrear portion and an upstanding front portion,

b. a turned over inwardly extending portion formed lon the top of saidfront portion and having a downwardly facing abutment surface adapted toengage the top surface of the table adjacent an edge of the table top,

c. a vertically disposed inwardly facing abutment surface formed on thefront portion of said clamp adapted to engage the front edge of thetable top yadjacent said turned over inwardly extending portion 4of saidclamp,

d. an abutment pad formed on top of said rear por- -tion and having anupwardly facing abutment surface adapted to engage the bottom surface ofthe table top,

e. means on the upper part tof said front pontion for supporting adrawing board and the like on said clamp,

f. means on said clamp adapted to engage the inside surface of the tableapron with horizontal pressure parallel to and below said abutmentsurface on said turned over inwardly extending portion and said abutmentpad of said clamp and above the lower edge of the table apron in anopposed direction to said vertically disposed inwardly facing abutmentsurface on said front portion so as to rigidly secure said clamp to thetable,

g. said last mentioned means on said clamp comprising a horizontallydisposed clamp screw having a threaded portion passing through aclearance -hole formed in the front portion of said clamp,

a U-shaped member fixed to the outer end of said clamp screw adapted tolit around -the table apron and having, l i. an inner abutment surfaceadapted to engage the inside surface of the table apron,

j. and a wing nut `on said threaded portion of said clamp screw adaptedto be tightened against the outside face of said front portion of saidclamp.

3. A clamp, adapted to grip and hold an object to a table having a topand an apron depending downwardly from under said ltop, comprising incombination:

a. a C-shaped member having a horizontal bottom portion, an upstandingrear poration and an upstanding front portion,

b. a turned over inwardly extending portion formed on the top of saidfront portion and having a down wardly facing abutment surface adaptedto engage the top surface of the table adjacent an edge of the tabletop,

. a vertically disposed inwardly facing abutment surface formed on thefront portion of said clamp adapted to engage the front edge of thetable top adjacent said turned over inwardly extending portion of saidclamp,

d. an abutment pad formed on top of said rear portion and having anupwardly facing abutment surface adapted to engage the bottom surface ofthe table top,

. means on the upper part of. said front portion for supponting adrawing board and the like on said clamp,

. means on said clamp adapted to engage the inside said last mentionedmeans including a clamp screw having a threaded portion carried in amating horizontal threaded bore in said rear portion of said clampadapted to engage the inside surface of the table apron above the `loweredge thereof.

References Cited in the file of this patent UNITED STATES PATENTSBurnett ....1 Apr. 2, 1878 Scott Feb. 21, 1939

1. A CLAMP, ADAPTED TO GRIP AND HOLD AN OBJECT TO A TABLE HAVING A TOPAND AN APRON DEPENDING DOWNWARDLY FROM UNDER SAID TOP, COMPRISING INCOMBINATION A. A C-SHAPED MEMBER HAVING A HORIZONTAL BOTTOM PORTION, ANUPSTANDING REAR PORTION AND AN UPSTANDING FRONT PORTION, B. A TURNEDOVER INWARDLY EXTENDING PORTION FORMED ON THE TOP OF SAID FRONT PORTIONAND HAVING A DOWNWARDLY FACING ABUTMENT SURFACE ADAPTED TO ENGAGE THETOP SURFACE OF THE TABLE ADJACENT AN EDGE OF THE TABLE TOP, C. AVERTICALLY DISPOSED INWARDLY FACING ABUTMENT SURFACE FORMED ON THE FRONTPORTION OF SAID CLAMP ADAPTED TO ENGAGE THE FRONT EDGE OF THE TABLE TOPADJACENT SAID TURNED OVER INWARDLY EXTENDING PORTION OF SAID CLAMP, D.AN ABUTMENT PAD FORMED ON TOP OF SAID REAR PORTION AND HAVING ANUPWARDLY FACING ABUTMENT SURFACE ADAPTED TO ENGAGE THE BOTTOM SURFACE OFTHE TABLE TOP. E. MEANS ON THE UPPER PART OF SAID FRONT PORTION FORSUPPORTING A DRAWING BOARD AND THE LIKE ON SAID CLAMP, F. AND MEANS ONSAID CLAMP ADAPTED TO ENGAGE THE IN SIDE SURFACE OF THE TABLE APRON WITHHORIZONTAL PRESSURE PARALLEL TO AND BELOW SAID ABUTMENT SURFACE ON SAIDTURNED OVER INWARDLY EXTENDING PORTION AND SAID ABUTMENT PAD OF SAIDCLAMP AND ABOVE THE LOWER EDGE OF THE TABLE APRON IN AN OPPOSEDDIRECTION TO SAID VERTICALLY DISPOSED INWARDLY FACING ABUTMENT SURFACEON SAID FRONT PORTION SO AS TO RIGIDLY SECURE SAID CLAMP TO THE TABLE.